The subdwarf helium abundance and the rotation of the galactic halo

Details The subdwarf helium abundance and the rotation of the galactic halo The subdwarf helium abundance and the rotation of the galactic halo

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233..877c&link_type=abstract

Astrophysical Journal, Part 1, vol. 233, no. 3, Nov. 1, 1979, p. 877-887. Research supported by Harvard University.

Other

88

Abundance, Galactic Rotation, Helium, Milky Way Galaxy, Subdwarf Stars, Big Bang Cosmology, Radial Velocity, Stellar Luminosity, Stellar Motions, Stellar Temperature, Velocity Measurement

Scientific paper

Temperatures, barometric corrections, and metallicities for eight subdwarfs with good trigonometric parallaxes and 10 Hyades dwarfs are used to determine that subdwarfs lie well below the Hyades in the luminosity-temperature diagram. The subdwarf locus is compared to the theoretical isochrones of Ciardullo and Demarque to derive a subdwarf helium mass fraction. The adopted distance callibration is used to investigate the kinematics of the subdwarfs. Upon adopting 250 km/s as the rotational velocity of the local standard of rest about the galactic center, several subdwarfs were found to be moving in retrograde orbits while others were moving in direct circular orbits exceeding 400 km/s.

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